Metal shoe for concrete and other piles



June 16, 1925. 1,542,498

L. GARDINER IIITAL SHOE FOR CONCRETE AND OTHER FILES Filed llarch 7, 1924 I Qrifner E3 iii M Patented June 1925.

LUPTON GARDINER, OF MONGONUI, NORTH AUCKLAND, NEW ZEALAND.

METAL SHOE FOR CONOB-ETIii AND OTHER FILES.

Application filed March 7, 1924. Serial No. 697,554.

To all whom it may concern: Be it lmown that I, LUrToN GARDINER, subject of the King of'Great Britain, residing at Mongonui, North Auckland, in the Dominion of New Zealand, have invented new and useful Improvements in Metal Shoes for Concrete and Other Piles, of which the following is a specification.

This invention relates to the metallic shoes 1' used for pointing the ends of ferro-concrete and other piles used in various structural operations, and which shoes are generally formed of cast or wrought metal and are secured upon the pile end to facilitate the driving thereof into the ground.

The invention has been devised with the object of providing a shoe of this class that is so shaped that in its driving into the earth it will make a clearance for the pile itself.

1 This thereby will facilitate the driving operation, by reducing the frictional contact with the sides of the bore that is incidental to pile driving when the pile is shod with the forms of shoes hitherto employed.

The object of the invention is obtained by constructing the shoe around its top with edges slightly curving outwards and pro- 7 jecting beyond the corresponding edges of the pile on to which it is to be fitted, and

then with sides extending down to the usual point with the ordinary taper. This formation is adaptable to all shapes of shoes whether'of triangular, rectangular, or circular shape in plan. The invention is illustrated in the accompanying drawings, in which Figure l is a side elevation of a shoe of triangular form in plan, afiixed to a concrete pile. V i

Figure 2 is an underneath plan thereof.

Figure 3 is a perspective view of a square form of shoe in plan. I

Figure 4 is an underneath plan thereofr The shoes in all cases are made in any of the usual and well known ways by which the sides are formed, of metal strips AA tapering downwards from a top frame 13 and inwards to a central point C. These are D is thus formed the upper surface of which curves inwards to the pile surface while its lower side is made uniformly flat with the taper of the shoeside.

The size of the shoe at its top will thus exceed the cross-sectional sizeof the pile on to which the shoe is fastened, so that it makes a clearance for the pile as the pile is driven in the usual way. The extent of excess size given the shoe need not be very great as all that is required of it is to just provide a clearance against the frictional contact of the earth through which the pile is being driven.

A one-piece metal shoe for concrete and other piles, comprising a top frame, a centralpoint, and metal side strips tapering downward from the frame to said point; said frame being shaped to form a continuous rim which projects outward beyond the surface of the pile for which the shoe is made, the upper surface of the rim curving inward to the pile surface while the lower side of the rim is made uniformly flat with the taper of the side strips.

In testimony whereof, Iaflix my signature.

LUPTON GARDINER.

Witnesses: i JOSEPH STANLEIGH MoAvnN, DAVID BROWN HUTTON. 

